A boat moves up and down on a lake as a wave passes by. If the boat oscillates 10 times in 2 seconds, what is the period of the wave?

The period is the time for one oscillation. The boat makes 10 oscillations in 2 seconds, so the period is 2 ÷ 10 = 0.2 seconds per oscillation. Therefore, the correct choice is 0.2 seconds.

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